FISHERY BULLETIN: VOL. 74, NO. 4 



&-nigl 



D 



Figure S.—Phelliactis americana. n. sp. A. Section through the basal part of a tentacle. B. Section through a part 

 of the sphincter, showing the alveolar arrangement of the muscle fibrils (the fibrils are omitted in the figure). C. 

 Section through a retractor from the third cycle of mesenteries. D. Cross section of a part of a retractor of one of 

 the directive mesenteries, ent-entoderm, mgl-mesogloea. 



874 



